CN118232301A - DC micro-grid voltage control method considering adaptive power compensation - Google Patents
DC micro-grid voltage control method considering adaptive power compensation Download PDFInfo
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Abstract
A DC micro-grid voltage control method considering self-adaptive power compensation comprises the steps of constructing a DC micro-grid energy storage control module, and controlling numerical control power according to bus voltage by using the control module to enable an energy storage system of the DC micro-grid to adopt self-adaptive sagging control; constructing a direct current load control module, connecting a load to a direct current bus through the control module directly or through a load converter, wherein the load converter adopts constant voltage control; constructing a wind power control module; and constructing a photovoltaic control module, and controlling a photovoltaic system of the direct-current micro-grid through the control module to automatically adjust the power generation power according to the load power requirement. According to the invention, the voltage of the direct-current micro-grid is regulated and controlled in a system multi-module manner, the energy storage control module of the direct-current micro-grid adopts self-adaptive sagging to automatically coordinate load power distribution among different batteries according to the maximum power and the state of charge, so that overcharge and overdischarge of an energy storage system are avoided, and the voltage fluctuation is small.
Description
Technical Field
The invention relates to the technical field of direct-current micro-grids, in particular to a direct-current micro-grid voltage control method considering self-adaptive power compensation.
Background
The micro-grid is a grid form which effectively combines a micro power supply, a load and an energy storage device, can be used as an independent whole and can be operated in a grid-connected mode or independently operated, a direct-current transmission line is established in the micro-grid, and the direct-current micro-grid is formed by connecting each distributed power supply and an energy storage system, so that the advantage complementation and coordination control among the micro power supplies are facilitated.
For a micro-grid system, effective and accurate power distribution is always a basic requirement for micro-grid control, and since the micro-grid contains a large amount of renewable power sources and loads with large fluctuation ranges, energy storage equipment needs to be configured to maintain stable operation of the system. In a single microgrid, droop control can work in a communication-free environment and has high reliability and flexibility, so power distribution can be achieved through traditional droop control, but there are also some disadvantages such as low accuracy of voltage.
Disclosure of Invention
The invention aims to solve the problem of large voltage fluctuation in the prior art, and provides a direct current micro-grid voltage control method considering adaptive power compensation.
In order to solve the technical problems, the invention provides the following technical scheme:
A direct current micro grid voltage control method taking into account adaptive power compensation, the method comprising the steps of:
Step one: constructing an energy storage control module of the direct-current micro-grid, and controlling numerical control power according to bus voltage by using the energy storage system of the direct-current micro-grid through the control module by adopting self-adaptive sagging control;
Step two: automatically adjusting load power distribution among different energy storage units according to the SOC and the maximum power of each energy storage unit of the energy storage system of the direct current micro-grid;
Step three: constructing a direct current load control module, and connecting a load to a direct current bus through the control module directly or through a load converter, wherein the load converter adopts constant voltage control, so that the voltage stability fluctuation range is small;
Step four: constructing a wind power control module, determining the system characteristics of wind power generation in the direct-current micro-grid through the control module, and obtaining the actual output active power, the maximum and minimum allowable output frequencies, the actual output frequency reference value and the maximum output active power of the wind power generation system, so that the wind power system of the direct-current micro-grid can automatically adjust the output power according to the respective maximum power;
Step five: a photovoltaic control module is constructed, the photovoltaic system of the direct-current micro-grid is controlled by the control module to automatically adjust the generated power according to the requirement of the load power, and the voltage of a bus is increased to a rated value in a voltage feedforward compensation control mode, so that voltage fluctuation is reduced.
As a preferred embodiment of the dc micro-grid voltage control method according to the present invention, which considers adaptive power compensation, the method comprises: the micro-grid energy storage control module is used for monitoring the SOC value of each energy storage unit of the direct-current micro-grid, and only when the SOC value is large, the discharging power of the energy storage unit is large, the charging power is small, and when the SOC value is small, the charging power of each energy storage unit is large, and the discharging power is small.
As a preferred embodiment of the dc micro-grid voltage control method according to the present invention, which considers adaptive power compensation, the method comprises: when part of energy storage units in the direct current micro-grid are in fault, the micro-grid energy storage control module adjusts the output power of each energy storage unit to ensure the normal power supply of the compound.
As a preferred embodiment of the dc micro-grid voltage control method according to the present invention, which considers adaptive power compensation, the method comprises: in the fourth step, the energy storage control module of the direct current micro-grid sets P Real world as the actual output active power of the wind power generation system; f min and f max are minimum and maximum allowable output frequencies; f Real world 、f Ginseng radix is the actual output frequency and the actual output frequency reference value respectively; the maximum output active power of P max is as follows:
and the wind power control module adjusts the generated power according to the self-adaption.
As a preferred embodiment of the dc micro-grid voltage control method according to the present invention, which considers adaptive power compensation, the method comprises: the photovoltaic control module adjusts the generated power in proportion to the maximum generated power of each photovoltaic unit of the direct-current micro-grid.
As a preferred embodiment of the dc micro-grid voltage control method according to the present invention, which considers adaptive power compensation, the method comprises: the photovoltaic control module sets the minimum output voltage and the maximum output voltage of each photovoltaic unit of the direct-current micro-grid to be Umin and Umax respectively, the terminal voltage of the photovoltaic unit and the reference value of the terminal voltage are Ud and Udc respectively, and the output power and the maximum allowable output power of the photovoltaic unit are P Light source and P Light source max respectively, and the expression is:
the photovoltaic control module automatically adjusts the generated power according to the formula.
As a preferred embodiment of the dc micro-grid voltage control method according to the present invention, which considers adaptive power compensation, the method comprises: the direct-current micro-grid energy storage control module sets a power exchange control rule, and can automatically switch corresponding working modes according to the current load level of the micro-grid, so that exchange power loss is reduced, and energy storage life is prolonged. The power exchange control rule can ensure that the voltage of the control bus of the converter is stable in all the different working modes, and the different working modes can be smoothly switched, so that the power exchange control rule has fast response and small fluctuation.
The invention has the beneficial effects that: according to the invention, the voltage of the direct-current micro-grid is regulated and controlled in a system multi-module manner, the energy storage control module of the direct-current micro-grid adopts self-adaptive sagging to automatically coordinate load power distribution among different batteries according to the maximum power and the state of charge, so that the over-charge and over-discharge of an energy storage system are avoided, the voltage fluctuation is small, and the voltage of a bus is stabilized at a rated value by adjusting the output power of a photovoltaic power generation power and a wind power system, so that the fluctuation of the voltage is further reduced, and the stable control of the voltage is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
Fig. 1 is a schematic diagram of an overall framework of a dc micro-grid voltage control method that takes into account adaptive power compensation according to the present invention;
fig. 2 is a schematic flow chart of a direct current micro-grid voltage control method considering adaptive power compensation according to the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Referring to fig. 1-2, for one embodiment of the present invention, a dc micro-grid voltage control method is provided that considers adaptive power compensation, the method comprising the steps of: .
Step one: constructing an energy storage control module of the direct-current micro-grid, and controlling numerical control power according to bus voltage by using the energy storage system of the direct-current micro-grid through the control module by adopting self-adaptive sagging control;
Step two: automatically adjusting load power distribution among different energy storage units according to the SOC and the maximum power of each energy storage unit of the energy storage system of the direct current micro-grid;
Specifically, the micro-grid energy storage control module is used for monitoring the SOC value of each energy storage unit of the direct-current micro-grid, and only when the SOC value is large, the discharging power of the energy storage unit is large, the charging power is small, and when the SOC value is small, the charging power of each energy storage unit is large, and the discharging power is small.
In addition, when part of energy storage units in the direct-current micro-grid fail, the micro-grid energy storage control module adjusts the output power of each energy storage unit to ensure the normal power supply of the compound, and the direct-current micro-grid energy storage control module sets a power exchange control rule and can automatically switch corresponding working modes according to the load level of the current micro-grid, so that the exchange power loss is reduced, and the energy storage life is prolonged.
Step three: constructing a direct current load control module, and connecting a load to a direct current bus through the control module directly or through a load converter, wherein the load converter adopts constant voltage control, so that the voltage stability fluctuation range is small;
It should be noted that, the direct current load control module can also be controlled by setting a direct current load switch unit alone, and the module monitors whether the autonomous power limiting direct current load control device operates in the power limiting range allowed by the direct current micro-grid, if the autonomous power limiting direct current load control device exceeds the power limiting range, the branch is disconnected rapidly, and the power flow of the direct current micro-grid is controlled to operate stably in a cooperative manner.
Step four: the wind power control module is constructed, the system characteristics of wind power generation in the direct-current micro-grid are determined through the control module, and the actual output active power, the maximum and minimum allowable output frequencies, the actual output frequency reference value and the maximum output active power of the wind power generation system are obtained, so that the output power of the wind power system of the direct-current micro-grid is automatically adjusted according to the respective maximum power.
Specifically, the wind power control module sets P Real world as the actual output active power of the wind power generation system; f min and f max are minimum and maximum allowable output frequencies; f Real world 、f Ginseng radix is the actual output frequency and the actual output frequency reference value respectively; the maximum output active power of P max is as follows:
the wind power control module adjusts the power generation power according to the self-adaption;
Step five: a photovoltaic control module is constructed, a photovoltaic system of the direct-current micro-grid is controlled by the control module to automatically adjust the power generation power according to the requirement of the load power, and the voltage feedforward compensation control mode is adopted to boost the bus voltage to the rated value, so that the voltage fluctuation is reduced;
that is, the photovoltaic control module adjusts the generated power in proportion to the maximum generated power of the respective photovoltaic units of the direct current micro grid.
Further, the photovoltaic control module sets a minimum output voltage and a maximum output voltage of each photovoltaic unit of the direct current micro-grid to be Umin and Umax respectively, a terminal voltage of each photovoltaic unit and a reference value thereof to be Ud and Udc respectively, and an output power and a maximum allowable output power of each photovoltaic unit to be P Light source and P Light source max respectively, wherein the expressions are as follows:
Wherein, the photovoltaic control module automatically adjusts the generated power according to the above mode
According to the invention, the voltage of the direct-current micro-grid is regulated and controlled in a system multi-module manner, the energy storage control module of the direct-current micro-grid adopts self-adaptive sagging to automatically coordinate load power distribution among different batteries according to the maximum power and the state of charge, so that the over-charge and over-discharge of an energy storage system are avoided, the voltage fluctuation is small, and the voltage of a bus is stabilized at a rated value by adjusting the output power of a photovoltaic power generation power and a wind power system, so that the fluctuation of the voltage is further reduced, and the stable control of the voltage is achieved.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. The direct current micro-grid voltage control method taking into account the self-adaptive power compensation is characterized by comprising the following steps of:
step one: constructing a direct-current micro-grid energy storage control module, and controlling numerical control power according to bus voltage by enabling an energy storage system of the direct-current micro-grid to adopt self-adaptive droop control through the direct-current micro-grid energy storage control module;
Step two: automatically adjusting load power distribution among different energy storage units according to the SOC and the maximum power of each energy storage unit of the energy storage system of the direct current micro-grid;
Step three: constructing a direct current load control module, wherein a load is directly connected to a direct current bus through the direct current load control module or through a load converter, and the load converter adopts constant voltage control, so that the voltage stability fluctuation range is small;
step four: constructing a wind power control module, determining the system characteristics of wind power generation in the direct-current micro-grid through the wind power control module, and obtaining the actual output active power, the maximum and minimum allowable output frequencies, the actual output frequency reference value and the maximum output active power of the wind power generation system, so that the wind power system of the direct-current micro-grid automatically adjusts the output power according to the respective maximum power;
Step five: and constructing a photovoltaic control module, controlling a photovoltaic system of the direct-current micro-grid through the photovoltaic control module to automatically adjust the generated power according to the requirement of the load power, and improving the bus voltage to a rated value in a voltage feedforward compensation control mode so as to reduce voltage fluctuation.
2. The direct current micro grid voltage control method considering adaptive power compensation according to claim 1, wherein: the micro-grid energy storage control module is used for monitoring the SOC value of each energy storage unit of the direct-current micro-grid, and only when the SOC value is large, the discharging power of the energy storage unit is large, the charging power is small, and when the SOC value is small, the charging power of each energy storage unit is large, and the discharging power is small.
3. The direct current micro grid voltage control method considering adaptive power compensation according to claim 1, wherein: when part of energy storage units in the direct-current micro-grid fail, the micro-grid energy storage control module obtains the residual electric quantity of each energy storage unit in real time and adaptively sends out a power adjustment instruction to adjust the output power of each energy storage unit so as to ensure the normal power supply of the combination.
4. The direct current micro grid voltage control method considering adaptive power compensation according to claim 1, wherein: in the first step, the energy storage control module of the direct current micro-grid sets a power exchange control rule, and can automatically switch corresponding working modes according to the load level of the current micro-grid, so that the exchange power loss is reduced, and the energy storage life is prolonged.
5. The method for controlling voltage of a direct current micro grid taking into account adaptive power compensation according to claim 4, wherein: the corresponding working modes are as follows:
Mode 1, normal operation of an energy storage system;
mode 2, partial energy storage unit failure;
mode 3, the energy storage system is out of operation;
mode 4, and the energy storage system exit run time section DG unit failure.
6. The method for controlling voltage of a direct current micro grid taking into account adaptive power compensation according to claim 4, wherein:
Mode 1 is that a DG system adopts MPPT control to generate power with maximum power, and an energy storage system adopts self-adaptive droop control balance system power supply and demand;
The mode 2 is that when the discharge power of an energy storage system required in an independent direct current micro-grid exceeds the maximum allowable output power, the bus voltage is reduced due to insufficient active power in the micro-grid, and at the moment, the secondary load is required to be cut off according to the load priority to ensure the normal power supply of the important load;
Mode 3 is that excessive active power in the micro-grid will cause the busbar voltage to rise, and at this time, the DG system needs to be controlled to reduce the generated power to keep the busbar voltage stable;
and in the mode 4, part of photovoltaic units in the mode 3 enter the mode when exiting operation due to faults and the like, and at the moment, the DG units which are in normal operation automatically adjust the generated power to bear the power of the fault units so as to ensure that important loads are powered normally.
7. The direct current micro grid voltage control method considering adaptive power compensation according to claim 1, wherein: in the fourth step, the wind power control module sets P Real world as the active power actually output by the wind power generation system; f min and f max are minimum and maximum allowable output frequencies; f Real world 、f Ginseng radix is the actual output frequency and the actual output frequency reference value respectively; the maximum output active power of P max is as follows:
and the wind power control module adjusts the generated power according to the self-adaption.
8. The direct current micro grid voltage control method considering adaptive power compensation according to claim 1, wherein: and in the fifth step, the photovoltaic control module adjusts the generated power in proportion to the maximum generated power of each photovoltaic unit of the direct-current micro-grid.
9. The direct current micro grid voltage control method considering adaptive power compensation according to claim 1, wherein: in the fifth step, the photovoltaic control module controls the photovoltaic system of the direct current micro-grid to automatically adjust the power generation power according to the load power demand, and the method specifically comprises the following steps:
The photovoltaic control module sets the minimum output voltage and the maximum output voltage of each photovoltaic unit of the direct-current micro-grid to be Umin and Umax respectively, the terminal voltage of the photovoltaic unit and the reference value of the terminal voltage are Ud and Udc respectively, and the output power and the maximum allowable output power of the photovoltaic unit are P Light source and P Light source max respectively, and the expression is:
the photovoltaic control module automatically adjusts the generated power according to the formula.
10. A direct current micro-grid voltage control system considering adaptive power compensation is characterized in that: comprising the following steps: an energy storage system of the direct current micro-grid adopts self-adaptive droop control, and numerical control power is controlled according to bus voltage; the direct-current micro-grid energy storage control module automatically adjusts load power distribution among different energy storage units according to the SOC and the maximum power of each energy storage unit of the energy storage system of the direct-current micro-grid;
the direct current load control module is used for connecting a load to a direct current bus directly or through a load converter, and the load converter is controlled by constant voltage;
The wind power control module is used for adjusting the power output of the wind power system, determining the system characteristics of wind power generation in the direct-current micro-grid, and automatically adjusting the output power of the wind power system of the direct-current micro-grid according to the respective maximum power;
the photovoltaic control module is used for adjusting the photovoltaic power generation power, the photovoltaic system of the direct-current micro-grid is controlled by the photovoltaic control module to automatically adjust the power generation power according to the requirement of the load power, and the voltage feedforward compensation control mode is adopted to increase the bus voltage to the rated value so as to reduce voltage fluctuation.
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